<script setup>
import {ref,watch,defineProps} from 'vue'
import { useMouseInElement } from '@vueuse/core';
// 图片列表
const imageList = ref([
  "https://yanxuan-item.nosdn.127.net/d917c92e663c5ed0bb577c7ded73e4ec.png",
  "https://yanxuan-item.nosdn.127.net/e801b9572f0b0c02a52952b01adab967.jpg",
  "https://yanxuan-item.nosdn.127.net/b52c447ad472d51adbdde1a83f550ac2.jpg",
  "https://yanxuan-item.nosdn.127.net/f93243224dc37674dfca5874fe089c60.jpg",
  "https://yanxuan-item.nosdn.127.net/f881cfe7de9a576aaeea6ee0d1d24823.jpg"
])

defineProps(['picList'])
const picIndex = ref(0)
const target = ref(null)
const {elementX,elementY,isOutside } = useMouseInElement(target)
const layerX = ref(0)
const layerY = ref(0)
// watch(elementX,(newValue)=>{
//     if(!isOutside){
//         layerX.value = (newValue-100<0?0:newValue-100 && newValue-100>200?200:newValue-100)
//     }
// })
// watch(elementY,(newValue)=>{
//     if(!isOutside){
//         layerY.value = (newValue-100<0?0:newValue-100 && newValue-100>200?200:newValue-100)
//     }
// })
//监听鼠标位置变化，根据鼠标在 图片所在位置范围，更改蒙层滑块位置
watch([isOutside,elementX,elementY],(newValue)=>{
    if(!newValue[0]){
        layerX.value = (newValue[1]-100<0?0:newValue[1]-100 && newValue[1]-100>200?200:newValue[1]-100)
        layerY.value = (newValue[2]-100<0?0:newValue[2]-100 && newValue[2]-100>200?200:newValue[2]-100)
    }
})
</script>


<template>
  <div class="goods-image">
    <!-- 左侧大图-->
    <div class="middle" ref="target">
      <img :src="picList?.[picIndex]" alt="" />
      <!-- 蒙层小滑块 -->
      <div class="layer" :style="{ left: `${layerX}px`, top: `${layerY}px` }"></div>
    </div>
    <!-- 小图列表 -->
    <ul class="small">
      <li v-for="(img, i) in picList" :key="i" @click="picIndex = i" :class="{active:picIndex==i }">
        <img :src="img" alt="" />
      </li>
    </ul>
    <!-- 放大镜大图 -->
    <div class="large" :style="[
      {
        backgroundImage: `url(${picList?.[picIndex]})`,
        backgroundPositionX: `${-2*layerX}px`,
        backgroundPositionY: `${-2*layerY}px`,
      },
    ]" v-show="!isOutside"></div>
  </div>
</template>

<style scoped lang="scss">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;

  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
  }

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    z-index: 500;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    // 背景图:盒子的大小 = 2:1  将来控制背景图的移动来实现放大的效果查看 background-position
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }

  .layer {
    width: 200px;
    height: 200px;
    background: rgba(0, 0, 0, 0.2);
    // 绝对定位 然后跟随咱们鼠标控制left和top属性就可以让滑块移动起来
    left: 0;
    top: 0;
    position: absolute;
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid $xtxColor;
      }
    }
  }
}
</style>